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Cool It! is the new card game from the Union of Concerned Scientists that teaches kids about the choices we have when it comes to climate change—and how policy and technology decisions made today will matter. Cool It! is available in our online store.

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How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more

The pinpoints of light that you see in the night sky are stars. Your ability to see the stars depends on how bright they are, as well as how close they are to Earth. Stars are giant balls of gas in space...more

1998 was a very full year when it came to space exploration and history making. In the blast-from-the-past department, John Glenn received another go for a launch aboard Space Shuttle Discovery. After...more

We could learn a lot about the solar wind if we could put satellite in one place in space. Changes in the solar wind could be measured easily. If the satellite is between Earth and the Sun, it could be...more

When the temperature of the core of a star reaches about 16 million kelvins (that's REALLY hot!), Helium is made through another fusion cycle. This cycle is named the Carbon-Nitrogen-Oxygen (CNO) cycle....more

A gas cloud, if big enough, starts to shrink. The density and temperature increase so nuclear fusion can start. This is when Hydrogen is turned into Helium. The "burning" of Hydrogen stops the gas cloud...more

The number of sunspots on the Sun is not constant. In addition to the obvious variation caused by the Sun's rotation (sunspots disappear from view and then re-appear), over time new sunspot groups form...more

Solar eclipses are really neat to look at! But you have to be very careful. If you look right at the Sun, it will hurt your eyes! There are lots of ways to protect them. Take a black piece of paper and...more